Sea Shepherd Australia chairman Bob Brown predicts the Japanese ship will follow the Bob Barker into Australian waters tomorrow morning.

Mr Brown says it is time for the Federal Government to intervene.

"This is an Australian territorial whale sanctuary, the Australian Federal Court has ruled that the Japanese have breached Australian law in their atrocious whale behaviour and there is in an injunction out restraining them," he said.

"We've asked the Government to prevent this harpoon ship from entering our territorial waters. [It's] no different to entering the Derwent...or entering Sydney Harbour, or Port Phillip.

"This ship should be told it's not welcome here and the Japanese should have it made clear that if they do enter these waters they will get that injunction put on them and Australian law will be brought to bear on the captain and everybody on that ship."